78531315 has 16 divisors (see below), whose sum is σ = 131113728. Its totient is φ = 40062176.

The previous prime is 78531289. The next prime is 78531367. The reversal of 78531315 is 51313587.

It is a cyclic number.

It is not a de Polignac number, because 78531315 - 2¹¹ = 78529267 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113469 + ... + 114158.

It is an arithmetic number, because the mean of its divisors is an integer number (8194608).

Almost surely, 2^78531315 is an apocalyptic number.

78531315 is a deficient number, since it is larger than the sum of its proper divisors (52582413).

78531315 is a wasteful number, since it uses less digits than its factorization.

78531315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227658.

The product of its digits is 12600, while the sum is 33.

The square root of 78531315 is about 8861.7896048146. The cubic root of 78531315 is about 428.2338137108.

The spelling of 78531315 in words is "seventy-eight million, five hundred thirty-one thousand, three hundred fifteen".